如何在Android中使用ColorStateList

Question

我希望在不同状态下改变按钮文本颜色，如btn_presses、btn_focus等。

为此，我使用了colorstatelist.xml，并在titlebarlayout.xml中引用了它。但是，我仍然无法改变按钮文本的颜色。

有人知道怎么做吗？我的代码哪里出了问题。

MainActivity.java

public class MainActivity extends Activity implements OnClickListener {

        EditText emailEdit, passwordEdit;
        Button loginButton;
        String email, password;
        TitleBarLayout titlebarLayout;
        String r;
        String rr;

        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.login_activity);

            emailEdit = (EditText) findViewById(R.id.etEmail);
            passwordEdit = (EditText) findViewById(R.id.etPassword);

            loginButton = (Button) findViewById(R.id.loginButton);
            loginButton.setOnClickListener(this);

            // titlebarLayout=(TitleBarLayout) findViewById(R.id.titlebar);
            titlebarLayout = new TitleBarLayout(MainActivity.this);
            titlebarLayout.setLeftButtonText("");
            titlebarLayout.setRightButtonText("Logout");
            titlebarLayout.setTitle("iProtect");
            //titlebarLayout.setLeftButtonSize(50,50);
            //titlebarLayout.setRightButtonSize(100,50);
            titlebarLayout.setLeftButtonBackgroundColor(Color.rgb(34,49,64));
            titlebarLayout.setRightButtonBackgroundColor(Color.rgb(34,49,64));
            titlebarLayout.setLeftButtonTextColor(Color.rgb(255,255,255));
            titlebarLayout.setRightButtonTextColor(Color.rgb(255,255,255));


            XmlResourceParser parser =getResources().getXml(R.color.colorstatelist);

                ColorStateList colorStateList;
                try {
                    colorStateList = ColorStateList.createFromXml(getResources(), parser);

                    titlebarLayout.setLeftButtonTextColor(colorStateList);
                } catch (XmlPullParserException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
    //      ColorStateList colorlist=new ColorStateList( new int[][] { new int[] { android.R.attr.state_focused }, new int[0], }, new int[] { Color.rgb(0, 0, 255), Color.BLACK, } );
    //      titlebarLayout.setLeftButtonTextColor(colorlist);


            OnClickListener listener = new OnClickListener() {

                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    if (v.getId() == R.id.left_button) {

                    } else if (v.getId() == R.id.right_button) {

                    }
                }
            };
            titlebarLayout.setLeftButtonOnClickListener(listener);
            titlebarLayout.setRightButtonOnClickListener(listener);
        }

TitleBarLayout.java

public class TitleBarLayout {

    private Activity activityRef;
    private View contentView;
    private Button leftButton, rightButton;
    TextView titletext;

    public TitleBarLayout(Activity a) {
        Log.i("TitleBar Layout", "Inside constructor");
        activityRef = a;
        inflateViewsFromXml();
        setListenersOnViews();
        setValuesOnViews();
    }

    private void setValuesOnViews() {
        leftButton.setText("");
        rightButton.setText("");
    }

    private void setListenersOnViews() {
        leftButton.setOnClickListener(listener);
        rightButton.setOnClickListener(listener);
    }

    private final OnClickListener listener = (new OnClickListener() {

        @Override
        public void onClick(View v) {
            activityRef.finish();
        }
    });

    private void inflateViewsFromXml() {
        contentView = activityRef.findViewById(R.id.titlebar);
        rightButton = (Button) contentView.findViewById(R.id.right_button);
        leftButton = (Button) contentView.findViewById(R.id.left_button);
        titletext = (TextView) contentView.findViewById(R.id.title_textview);
    }

    public void setLeftButtonText(int resID) {
        leftButton.setText(resID);
    }

    public void setLeftButtonText(String text) {
        leftButton.setText(text);
    }

    public void setLeftButtonOnClickListener(View.OnClickListener listener) {
        leftButton.setOnClickListener(listener);
    }

    public void setRightButtonText(int resID) {
        rightButton.setText(resID);
    }

    public void setRightButtonText(String text) {
        rightButton.setText(text);
    }

    public void setRightButtonOnClickListener(View.OnClickListener listener) {
        rightButton.setOnClickListener(listener);
    }

    public void setTitle(int resID) {
        titletext.setText("" + resID);
    }

    public void setTitle(String text) {
        titletext.setText(text);
    }

    public void setLeftButtonSize(int width, int height) {
        Log.i("Button" ,"Width"+width);
        leftButton.setWidth(width);
        leftButton.setHeight(height);
    }

    public void setRightButtonSize(int width, int height) {

        Log.i("Button" ,"Width"+width);
        rightButton.setWidth(width);
        rightButton.setHeight(height);
    }

    public void setLeftButtonBackgroundResource(int backgroundResource) {

    }

    public void setRightButtonBackgroundResource(int backgroundResource) {

    }

    public void setLeftButtonBackgroundColor(int backgroundColor) {
        Log.i("Button" ,"COLOR"+backgroundColor);
        leftButton.setBackgroundColor(backgroundColor);
    }

    public void setRightButtonBackgroundColor(int backgroundColor) {
        Log.i("Button" ,"COLOR"+backgroundColor);
        rightButton.setBackgroundColor(backgroundColor);
    }

    public void setLeftButtonTextColor(int textcolor) {
        Log.i("Button" ,"COLOR"+textcolor);
        leftButton.setTextColor(textcolor);
    }

    public void setRightButtonTextColor(int textcolor) {
        Log.i("Button" ,"COLOR"+textcolor);
        rightButton.setTextColor(textcolor);
    }

    public void setLeftButtonTextColor(ColorStateList colorStateList) {
        leftButton.setTextColor(colorStateList);

    }

    public void setRightButtonTextColor(ColorStateList colorStateList) {

    }
}

color.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <color name="title_bg_color">#2e4256</color>
    <color name="layout_bg_color">#dcdcdc</color>
    <color name="state_pressed">#ffffff</color>
    <color name="state_selected">#00ff00</color>
    <color name="state_focused">#0000ff</color>

</resources>

titlebarlayout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="@dimen/titlebar_height"
    android:background="@color/title_bg_color"
    android:gravity="center_vertical"
    android:orientation="horizontal" >

    <Button
        android:id="@+id/left_button"
        android:layout_width="@dimen/titlebar_button_width"
        android:layout_height="@dimen/titlebar_button_height"
        android:text=""
        android:clickable="true"
        android:textColor="@color/colorstatelist"
        android:background="@drawable/button_shape_drawable"
        android:layout_marginLeft="10dp"/>

    <TextView
        android:id="@+id/title_textview"
        android:layout_width="0dip"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:gravity="center"
        android:text=""
        android:textColor="@android:color/white"
        android:textStyle="bold" />

    <Button
        android:id="@+id/right_button"
        android:layout_width="@dimen/titlebar_button_width"
        android:layout_height="@dimen/titlebar_button_height"
        android:text=""
        android:clickable="true"
        android:layout_marginRight="10dp"
        android:background="@drawable/button_shape_drawable"
        android:textColor="@color/colorstatelist" />

</LinearLayout>

colorstatelist.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true"
          android:color="@color/state_pressed"/>
    <item android:state_selected="true"
          android:color="@color/state_selected"/>
    <item android:state_focused="true"
          android:color="@color/state_focused"/>
    <item android:color="#808080"/>
</selector>

- Ani

---

当我从mainActivity.java中删除setLeftButtonBackgroundColor()和setRightButtonBackgroundColor()的调用时，它可以正常工作。但是在这些调用存在的情况下，它会设置按钮的背景颜色，但按钮文本颜色的更改不会发生。 - Ani

Answer 1

首先，从您的代码中删除所有XML解析相关的内容，这些只会引入一些错误。您可以使用两种方法之一，而不是两者都使用。

您的布局XML已经将android:textColor设置为所需的状态列表。这就是您需要做的全部。按钮文本将根据其状态自动更改颜色。只需从Java代码中删除所有对setTextColor的调用：目前，这些调用正在用静态颜色替换状态列表。建议您完全删除TitleBarLayout.java中的setLeft/RightButtonTextColor方法，然后让IDE查找所有对它们的调用，并将其删除。

或者，如果您想从Java代码而不是XML中设置颜色，只需像这样调用：

button.setTextColor(getResources().getColorStateList(R.color.colorstatelist));

无需进行XML解析。

- Dan Hulme